projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ae6b8730 RH |
1 | /* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less |
| 2 | than N. | |
| 3 | For SPARC v7. | |
| 4 | Copyright (C) 1996,1999 Free Software Foundation, Inc. | |
| 5 | This file is part of the GNU C Library. | |
| 6 | Contributed by Jakub Jelinek <jj@ultra.linux.cz> and | |
| 7 | David S. Miller <davem@caip.rutgers.edu>. | |
| 8 | ||
| 9 | This version is developed using the same algorithm as the fast C | |
| 10 | version which carries the following introduction: | |
| 11 | ||
| 12 | Based on strlen implementation by Torbjorn Granlund (tege@sics.se), | |
| 13 | with help from Dan Sahlin (dan@sics.se) and | |
| 14 | commentary by Jim Blandy (jimb@ai.mit.edu); | |
| 15 | adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), | |
| 16 | and implemented by Roland McGrath (roland@ai.mit.edu). | |
| 17 | ||
| 18 | The GNU C Library is free software; you can redistribute it and/or | |
| 19 | modify it under the terms of the GNU Library General Public License as | |
| 20 | published by the Free Software Foundation; either version 2 of the | |
| 21 | License, or (at your option) any later version. | |
| 22 | ||
| 23 | The GNU C Library is distributed in the hope that it will be useful, | |
| 24 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 26 | Library General Public License for more details. | |
| 27 | ||
| 28 | You should have received a copy of the GNU Library General Public | |
| 29 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 30 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 31 | Boston, MA 02111-1307, USA. */ | |
| 32 | ||
| 33 | #include <sysdep.h> | |
| 34 | ||
| 35 | .text | |
| 36 | .align 4 | |
| 37 | 0: cmp %o2, 0 | |
| 38 | be 9f | |
| 39 | sethi %hi(0x80808080), %o4 | |
| 40 | ldub [%o0], %g4 | |
| 41 | cmp %g4, %o1 | |
| 42 | be 1f | |
| 43 | add %o0, 1, %o0 | |
| 44 | subcc %o2, 1, %o2 | |
| 45 | be 9f | |
| 46 | andcc %o0, 3, %g0 | |
| 47 | be 4f | |
| 48 | or %o4, %lo(0x80808080), %o3 | |
| 49 | ldub [%o0], %g4 | |
| 50 | cmp %g4, %o1 | |
| 51 | be 1f | |
| 52 | add %o0, 1, %o0 | |
| 53 | subcc %o2, 1, %o2 | |
| 54 | be 9f | |
| 55 | andcc %o0, 3, %g0 | |
| 56 | be 5f | |
| 57 | sethi %hi(0x01010101), %o5 | |
| 58 | ldub [%o0], %g4 | |
| 59 | cmp %g4, %o1 | |
| 60 | be 1f | |
| 61 | add %o0, 1, %o0 | |
| 62 | subcc %o2, 1, %o2 | |
| 63 | bne,a 7f | |
| 64 | and %o2, 3, %g1 | |
| 65 | retl | |
| 66 | clr %o0 | |
| 67 | 1: retl | |
| 68 | sub %o0, 1, %o0 | |
| 69 | ||
| 70 | ENTRY(memchr) | |
| 71 | andcc %o1, 0xff, %o1 | |
| 72 | sll %o1, 8, %g7 | |
| 73 | andcc %o0, 3, %g0 | |
| 74 | or %o1, %g7, %g7 | |
| 75 | sll %g7, 16, %o3 | |
| 76 | bne 0b | |
| 77 | or %o3, %g7, %g2 | |
| 78 | sethi %hi(0x80808080), %o4 | |
| 79 | or %o4, %lo(0x80808080), %o3 | |
| 80 | 4: sethi %hi(0x01010101), %o5 | |
| 81 | 5: and %o2, 3, %g1 | |
| 82 | 7: andcc %o2, 0xfffffffc, %o2 | |
| 83 | be 0f | |
| 84 | or %o5, %lo(0x01010101), %g7 | |
| 85 | ld [%o0], %g4 | |
| 86 | 6: xor %g4, %g2, %g5 | |
| 87 | add %o0, 4, %o0 | |
| 88 | sub %g5, %g7, %g5 | |
| 89 | andcc %g5, %o3, %g0 | |
| 90 | bne 8f | |
| 91 | subcc %o2, 4, %o2 | |
| 92 | bne,a 6b | |
| 93 | ld [%o0], %g4 | |
| 94 | 0: cmp %g1, 0 | |
| 95 | 1: be 9f | |
| 96 | add %o0, 4, %o0 | |
| 97 | ldub [%o0 - 4], %g4 | |
| 98 | cmp %g4, %o1 | |
| 99 | be 4f | |
| 100 | cmp %g1, 1 | |
| 101 | be 9f | |
| 102 | ldub [%o0 - 3], %g4 | |
| 103 | cmp %g4, %o1 | |
| 104 | be 3f | |
| 105 | cmp %g1, 2 | |
| 106 | be 9f | |
| 107 | ldub [%o0 - 2], %g4 | |
| 108 | cmp %g4, %o1 | |
| 109 | be 2f | |
| 110 | nop | |
| 111 | 9: retl | |
| 112 | clr %o0 | |
| 113 | ||
| 114 | /* Check every byte. */ | |
| 115 | 8: srl %g4, 24, %g5 | |
| 116 | and %g5, 0xff, %g5 | |
| 117 | cmp %g5, %o1 | |
| 118 | be 4f | |
| 119 | srl %g4, 16, %g5 | |
| 120 | and %g5, 0xff, %g5 | |
| 121 | cmp %g5, %o1 | |
| 122 | be 3f | |
| 123 | srl %g4, 8, %g5 | |
| 124 | and %g5, 0xff, %g5 | |
| 125 | cmp %g5, %o1 | |
| 126 | be 2f | |
| 127 | and %g4, 0xff, %g5 | |
| 128 | cmp %g5, %o1 | |
| 129 | be 1f | |
| 130 | cmp %o2, 0 | |
| 131 | bne,a 6b | |
| 132 | ld [%o0], %g4 | |
| 133 | b 1b | |
| 134 | cmp %g1, 0 | |
| 135 | 1: retl | |
| 136 | sub %o0, 1, %o0 | |
| 137 | 2: retl | |
| 138 | sub %o0, 2, %o0 | |
| 139 | 3: retl | |
| 140 | sub %o0, 3, %o0 | |
| 141 | 4: retl | |
| 142 | sub %o0, 4, %o0 | |
| 143 | END(memchr) |